<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox" v-model="isAll" >
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      @keydoen.enter="downFn"
      v-model="task"
    />
  </header>
</template>

<script>
export default {
  props:["arr"],
  data() {
    return {
      task: ""
    };
  },
  methods: {
    downFn() {
      if (this.task.tirm().length === 0) {
        alert("任务名不能为空");
        return;
      }
      // 3.2(重要) - 当前任务名字要加到list数组里
      // 子传父技术
      this.$emit("create",this.task)
      this.task = ""
    }
  },
  computed:{
    isAll:{
      set(checked){
         this.arr.forEach(obj => obj.isDone = checked)
      },
      get(){
        return this.arr.length !==0 && this.arr.every(obj=>obj.isDone===true)
      }
    }
  }
};
</script>